10 



IXDIAXA UNIVERSITY STUDIES 



A conspicuous vertical blacli liumeral spat, sides gray, no caudal line, 

 no silvery lateral band or caudal spot, caudal and anal obscurely margined 

 with dark. 



Color in life brilliant; ventrals, anal and caudal bright cherry red. 

 dorsal sometiraes with less red ; region above anal with many cherry 

 chromatophores. 



Astyanax hasemani Eigenmann. sp. nov. 



5476 C. M. Type, about 55 mm. 5477a-e C. M. 13170 I. V. M. Paratypes. 9, 



25-55 mm. Porto Alegre, Jan. 21, 1909. Haseman. 



This species resembles A. essequWensis but differs in the more complete 

 armatuie of the cheek, in the more decurved lateral line. etc. It forms a 

 perfect bridge between Asti/anaa- and some species of Bryconamericus. It 

 always resembles thp latter genus in the complete armature of the cheek; 

 it usually resembles the former in having five teeth in the inner series of 

 the premaxillary, but in two of the specimens there are but four teeth in 

 this series. These specimens are t^l)ical members of the genus Bryconameri- 

 cus in all but the arrangenient of the teeth in the outer premaxillary series 

 which are in a straight line, a condition which is also found in Brycon- 

 americus ilieringi. 



Head 4.25; depth 3.2.5-3.33; D. 10; A. 21-24; scales 5-36 to 37-2.5: 

 eye equals postorbital portion of head, 2.5 in head, interorbital 3 in head : 

 depth of caudal peduncle 2 or a little less than 2 in the head. 



Compressed, dorsal and ventral profiles equally arched ; predorsal area 

 narrow, with about 12 scales in a median row. 



Occipital process about 1/S of the distance between its base and the 

 dorsal : interorbital more convex than in esscquRjensis : frontal f-tntniiPl 

 narrow, triangular, shorter than the parietal ; second suborbital leaviui: a 

 very r: arrow naked margin behind, in contact vrith the premaxillary for its 

 entire length below ; maxillary long, narrow, maxillary-premaxillary border 

 equal to the full length of the eye ; premaxillary v.-ith an anterior series of 

 three or four teeth in a straight row : four teyth in the second row in two 

 specimens, five in the others, maxillary usually ^^■ith four (rarely 3 or 5) 

 minute teeth : mandible with four or five tricuspid, rarely quinquicuspid 

 teeth ard about ten abruptly minute conical or tricuspid ones on rhe side. 



Scales everywhere regularly imbricate, no omitted or interpolated 

 scales; scales with up to seven radials. usually not more than two: anal 

 sheath composed of a single row of scales along the base of the anterior 

 rays : a few scales on bases of caudal lobes ; jixillary scale well developed, 

 lateral line deflected so that a line between its origin and end passes along 

 the upper exposed angles of the series of scales above it. 



Origin of dorsal slightly behind the middle; origin of ventinls but 

 slightly in advance of the vertical from the dorsal ; anal but slightly 

 emarginate; pectorals never quite reaching ventrals, sometimes falling 

 short of the width of two scales ; ventrals not reaching anal. 



Silvery, no distinct markings. 



